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A method to improve the demodulation speed and range of fiber grating at the same time

A fiber grating demodulation and speed technology, used in thermometers, measuring heat, measuring devices, etc., can solve the problems of increasing the cost of range and speed swept frequency lasers, and achieve wavelength repeatability, repeatability improvement, and cost control improvement. Effect

Active Publication Date: 2022-06-17
武汉奇测科技有限公司
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Problems solved by technology

[0005] Aiming at the defect that the optical fiber demodulation is contradictory between the range and the speed in the prior art and the technical problem that the cost of the frequency-swept laser with a large scanning range will increase significantly, the present invention provides a fiber grating demodulation speed and range simultaneously improved method

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  • A method to improve the demodulation speed and range of fiber grating at the same time
  • A method to improve the demodulation speed and range of fiber grating at the same time
  • A method to improve the demodulation speed and range of fiber grating at the same time

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[0031] In order to make the technical means, creative features, goals and effects realized by the present invention easy to understand, the present invention will be further described below with reference to specific embodiments and accompanying drawings, but the following embodiments are only preferred embodiments of the present invention, not all of them. . Based on the examples in the implementation manner, other examples obtained by those skilled in the art without creative work, all belong to the protection scope of the present invention.

[0032] Specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0033] refer to figure 1 , the device for simultaneously improving the demodulation speed and range of the fiber grating in this embodiment includes a frequency sweep laser 1, a fiber isolator 2, a fiber coupler 3, a fiber circulator 4, a FBG5, a photodetector 6, and a HCN gas absorption cavity 7 , wavelength sy...

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Abstract

A method for simultaneously improving the demodulation speed and range of fiber gratings, comprising frequency-sweeping lasers, fiber couplers, fiber circulators, FBGs, photodetectors, HCN gas absorption cavities, wavelength synchronous trigger units, data acquisition cards and computers. The device proposed by the invention can realize the high-speed and large-range demodulation of the FBG within the extremely short scanning frequency range of the frequency-sweeping laser. The method proposed by the invention breaks the limitation of the drift of the reflection peak of the traditional FBG demodulation, and only needs to pass a certain section of the reflection spectrum of the FBG to achieve the effect of the traditional FBG demodulation. The invention also proposes a wavelength synchronous trigger unit, which can use the data acquisition card to collect the FBG spectrum after wavelength calibration, thereby ensuring the wavelength repeatability of FBG demodulation. The present invention improves the three key parameters in FBG demodulation, demodulation speed, measurement range, and repeatability, and at the same time significantly improves cost control.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a method for simultaneously improving the demodulation speed and range of fiber gratings. Background technique [0002] FBG (Fiber Bragg Grating, Fiber Bragg Grating) demodulation based on tunable laser light source in fiber Bragg grating sensing demodulation technology has developed rapidly due to its unique technical advantages. The principle of FBG demodulation based on tunable laser light source is that the swept-frequency laser can scan the reflection spectrum peak of FBG. When the external temperature or strain acts on the FBG, the reflection spectrum will drift. It is only necessary to find out the drift of the peak. The temperature or strain of the measured object can be obtained. [0003] The demodulation speed of such FBG fiber grating demodulation technology mainly depends on the scanning repetition frequency of the laser (that is, the scanning repetitio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/3206G01B11/16G01D5/26
CPCG01K11/3206G01B11/165G01D5/268
Inventor 刘凤云
Owner 武汉奇测科技有限公司
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